I had small challenges with installation but anyhow, I did it in 15 minutes after finding this plugin.
First impression of the plugin is very very good. I am streaming events performed on river - and video is often over exposed because the water is reflecting light and light is changing during the day. While in outdoors it is sometimes difficult to see the level of light from monitor.
I took some over exposed videos and compared to videos where light was ok - this plugin really show the difference, which will help me to monitor the level of light on future events.
This really seems to be solution to monitor the level of the light.